Thanks apollo. I have tried the Mg quark, I like it a lot and it's on my shopping list for next year. Best way I can describe it is like green calcium. It's very bright both visually and imaging wise. As well as higher Strehl the longer wavelength (compared to Ca) means is less susceptible to poor seeing at the expense of resolution.

I did have some time with one a while back, but to me it looked much like my Ha Quark coloured red so I won't be getting one

Just for info, if I ever come over as "blunt" or upset it is not intentional, I am AUTISTIC, I have Aspergers, and ADHD, Autism, so my apologies if I ever sound, unintentionally confrontational. Thank you